William teottbe



paper may be subjected to pressure to disthe paper.

WILLIAM TROITER, JR, OF

PATENT Fries.

OYSTER BAY, NEW YORK.

MAKING LUMINOUS PAPER.

SPECIFICATION forming part of Letters Patent No. 274,415, dated March 20, 1883.

I Application filed October 31, 1882. (No specimens.)

To all whom it may concern Be it known that 1, WILLIAM Taorcrna, Jr.,. of Oyster Bay, in the county of Queens and State of New York, have invented a new and useful Improvement in Making Luminous Pa per, of which the following is a specification.

Myinvention is applicable to paper, cardboard, and other analogous materials which are included under the generic term paper.

The invention consists in a process of 'rendering paper uniformly luminous on its surface, said process consisting in applying to paper luminous or phosphorescent; material, or a composition containing such material, and in distributing such material or composition by pressure uniformly over the surface of the paper.

The invention further consists in applying to paper a composition composed of bichromate of potash, gelatine, sulphide of calcium, and water, and in distributing such composition by pressure uniformly over the surface of In carrying out my invention I mix together, in a dry state, about four parts, by weight, of bichromate of potash, forty-five parts of gelatiue, and fifty parts of sulphide of calcium, all of which materials or substances are ground together to insure their proper mixing or commingling to form a dry moss. I then form a waterproof paint by adding to two parts, by weight, of hot Water, one part of dry composition, and this paint may be laid on the paper with a brush. Unless something further were done, however, the paper having the luruinous composition applied to it would be streaky, and the luminosity would also be streaky, or, in other words, portions of the paper would have a greater degree of luminosity than other portions. In order to prevent such an undesirable result, I distribute the composition by pressure, and this pressure may be produced by calender-rolls of ordinary construction.

A single coat of the composition may be all that is required, and after it is applied the tribute the composition, or several coats or coverings of the composition may be applied, and in the latter case the paper should be subjected to pressure after each layer of composition is applied, in order to produce a hard, glossy, and uniform luminous surface. In any case the rolls or other devices whereby the pressure is applied for distributing the composition may be heated.

Instead of employing the composition in the form of a paint, I may coat or cover paper with glue or other adhesive sizing and then sprinkle or flock thereon sulphide of calcium in a dry state, after which the paper is subjected to pressure in the same manner as before described, for the purpose of uniformly distributing the said substance.- The glue or adhesive sizing may be applied so as to form patterns, and the sulphide of calcium willthen roduce luminouspatterns. The paper is sub- 'equently subjected to pressure to render the distribution of the luminous material uniform throughout the pattern.

By the term paper used herein I mean to include card-board and all analogous materials which may be considered as included by the term paper. 7

I do not claim, broadly, the production of a luminous material which may be applied to paper or card-board; nor do I claim, broadly, the production of paper or card-board having a luminous surface.

What I claim as my invention, and desire to secure by Letters Patent, is

1". The process of rendering paper uniformly luminous on its surface, consisting in applying to paper luminous or phosphorescent material, ora composition containing such material, 'and in distributing such material or composition 'by pressure uniformly over the surface of the paper desired to be covered,-substantially as herein described.

2. The process of rendering paper uniformly luminous on its surface, consisting in applying to the paper a'composition composed of hichromate of potash, gelatine, sulphide of calcium, and water, and in distributing such composition by pressure, substantially as herein described. 7

WM. TROTTER, JR. Witnesses:

FREDK. HAYNES, En L. MORAN. 

